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authorMark Fasheh <mark.fasheh@oracle.com>2006-09-22 17:28:19 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2006-09-24 13:50:46 -0700
commit24c19ef40474c3930597f31ae233dc06319bd881 (patch)
treee05b1cf72435d25bf47e67b206aa376bbea33b7d /fs/ocfs2/super.c
parentf9e2d82e6395cfa0802446b54b63cc412089d82c (diff)
ocfs2: Remove i_generation from inode lock names
OCFS2 puts inode meta data in the "lock value block" provided by the DLM. Typically, i_generation is encoded in the lock name so that a deleted inode on and a new one in the same block don't share the same lvb. Unfortunately, that scheme means that the read in ocfs2_read_locked_inode() is potentially thrown away as soon as the meta data lock is taken - we cannot encode the lock name without first knowing i_generation, which requires a disk read. This patch encodes i_generation in the inode meta data lvb, and removes the value from the inode meta data lock name. This way, the read can be covered by a lock, and at the same time we can distinguish between an up to date and a stale LVB. This will help cold-cache stat(2) performance in particular. Since this patch changes the protocol version, we take the opportunity to do a minor re-organization of two of the LVB fields. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/super.c')
-rw-r--r--fs/ocfs2/super.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 33a6de6fc61..4c29cd7cc8e 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -202,7 +202,7 @@ static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
mlog_entry_void();
- new = ocfs2_iget(osb, osb->root_blkno);
+ new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);
@@ -210,7 +210,7 @@ static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
}
osb->root_inode = new;
- new = ocfs2_iget(osb, osb->system_dir_blkno);
+ new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);